I recently did my endlinks and rear camber/toe kit on my Z (thank you, MRC for quick turn around and a good price).
The next upgrade on my list is either an LSD or a GTM valve body. I would rather do the diff first, but I am very hesitant to go for a clutch type (like Nismo) b/c of noise (I'd like to aviod the quaiffe if I could, b/c of price). I am hoping to find someone around my area that has a clutch type diff, so that I could hear it in person. Maybe the noise is not as bad as I fear and it is something I could deal with, especially considering that my car is not a DD.

Of course lunch/beers/whatever is on me...

Thank you.